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What the consensus “best” fluid to use for a clutch flush? I saw tons of threads on this but can’t find anything with a search. Was it Royal purple? More

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Old 08-26-2021, 01:09 PM   #1 (permalink)
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Default Sorry for being lazy...

What the consensus “best” fluid to use for a clutch flush? I saw tons of threads on this but can’t find anything with a search. Was it Royal purple? More importantly, what was the rating?

I’ve got 31,000 on the clock and I’m worried... tick Tock...
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Old 08-26-2021, 01:55 PM   #2 (permalink)
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Clutch flush. Castrol SRF, Motul 660, Motul 600. Best to better.
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Old 08-26-2021, 01:58 PM   #3 (permalink)
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Yup. You should be changing it every year if it is a fun car. Every six months if it is a daily driver.

Motul RBF 600 is what you should be using and is the 2nd best.

The best is technically Castrol SRF. But it is so expensive, that you will probably end up replacing less frequently.

RBF 600 replaced every year max is better than Castrol SRF that is so expensive you delay changing on time.
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Old 08-26-2021, 02:04 PM   #4 (permalink)
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Thanks! Youse guys are the best!
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Old 08-26-2021, 02:07 PM   #5 (permalink)
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Clutch flush. Castrol SRF, Motul 660, Motul 600. Best to better.
How much should I buy?
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Old 08-26-2021, 02:11 PM   #6 (permalink)
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Clutch flush. Castrol SRF, Motul 660, Motul 600. Best to better.
Hey Rusty, will any dot 4 synthetic fluid work? I see I can get my hands on this today. Want this done asap....

https://www.oreillyauto.com/detail/c...ke+fluid&pos=1
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Old 08-26-2021, 02:27 PM   #7 (permalink)
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Clutch flush. Castrol SRF, Motul 660, Motul 600. Best to better.
Ok, the 660 looks like my tolerance to price pain. How many milliliters?
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Old 08-26-2021, 02:33 PM   #8 (permalink)
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Don't get 660. It is meant for track, to be changed out after every track day, not street use. It has a worse wet boiling temperature which is more important for street use.

One bottle of 600 is all you need each time. Don't get the Prestone. Not worth the labour to put it in there.
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Old 08-26-2021, 03:17 PM   #9 (permalink)
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...........and since you will be under the car. Wrap your clutch line by the exhaust with some insulation. This will help to keep from boiling the fluid.
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Old 08-26-2021, 03:21 PM   #10 (permalink)
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...........and since you will be under the car. Wrap your clutch line by the exhaust with some insulation. This will help to keep from boiling the fluid.
If youse guys are interested, this looks like a good bargain. 1000ML for $30 including shipping.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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Old 08-26-2021, 03:27 PM   #11 (permalink)
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Originally Posted by MZ DAIZY View Post
If youse guys are interested, this looks like a good bargain. 1000ML for $30 including shipping.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
If you are close to a motorcycle shop. Check there for Motul. There used to be a couple of shops around me that carried it.
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Old 08-26-2021, 04:31 PM   #12 (permalink)
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Just to add my .02. Using Valvoline DOT4 Fluid. No issues with my spirited driving, clutch feel is solid, at WOT. Changed about 4 months ago. Should be noted I have heat insulation as well.

Been waiting for temps to drop a bit to go to the drag strip. That'll be the real test of how well this fluid will hold up to high temps. If I experience any sponge I'll be upgrading to MOTUL
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Old 08-27-2021, 05:14 AM   #13 (permalink)
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I use Valvoline DOT4 too. I use it not on the Z, but also on my other cars. The Z06 has the same type of clutch hydraulic as the Z, but the fluid in the Z06 turns dark much sooner in several hundred miles. The fluid in the reservoir is changed using a syringe. I need to do this with the Z as well.
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Old 08-30-2021, 09:28 AM   #14 (permalink)
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What is the best way and best material to use to insulate the clutch line?
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Old 08-30-2021, 11:36 AM   #15 (permalink)
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What is the best way and best material to use to insulate the clutch line?
This is just example, SO choose your size and material.

https://www.designengineering.com/he...0-5-1-25-x-36/
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